[FOLLOWUP] Clean up branch aliases needs COMPOSER_ROOT_VERSION

Build/Scripts/runTests.sh -s composerTestDistribution needs
COMPOSER_ROOT_VERSION set in CI.

Change-Id: I42fca3da99f6d92d15714f0966c0c81449eec236
Resolves: #96102
Releases: main
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72405
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

Build/testing-docker/local/docker-compose.yml

@@ -801,6 +801,7 @@ services:
     - /etc/group:/etc/group:ro
     working_dir: ${CORE_ROOT}
     environment:
+      COMPOSER_ROOT_VERSION: dev-main
       COMPOSER_CACHE_DIR: .cache/composer
     command: >
       /bin/sh -c "